LF444CM Equivalent & Substitute Parts

Part Overview

The LF444CM is a J-FET input operational amplifier with four independent circuits in a 14-SOIC surface mount package, manufactured by Texas Instruments. This device is classified as obsolete, though inventory remains available. The LF444CM operates across a 36V supply span with a 1 MHz gain bandwidth product and 1V/µs slew rate, designed for applications requiring low input bias current (10 pA) and low input offset voltage (3 mV).

Due to its obsolete status, equivalent and substitute parts are necessary for new designs, long-term availability assurance, and applications requiring enhanced performance specifications or extended operating temperature ranges.

Key Parameters

Parameter	LF444CM Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	4	—
Slew Rate	1	V/µs
Gain Bandwidth Product	1	MHz
Current - Input Bias	10	pA
Voltage - Input Offset	3	mV
Current - Supply (x4 Channels)	600	µA
Current - Output / Channel	14	mA
Voltage - Supply Span	36	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the LF444CM is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Direct Equivalents (Identical Electrical Specifications):

Amplifier type: J-FET
Number of circuits: 4
Package: 14-SOIC
Slew rate: 1 V/µs
Gain bandwidth product: 1 MHz
Input bias current: 10 pA
Input offset voltage: 3 mV
Supply span: 36 V
Output current per channel: 14 mA
Supply current: 600 µA (x4 channels)

Enhanced Performance Substitutes (Superior Specifications): Parts that exceed the LF444CM specifications in slew rate, gain bandwidth product, output current, or operating temperature range while maintaining J-FET amplifier topology and 4-circuit configuration in 14-SOIC packaging.

Functional Alternatives (Different Amplifier Type): General purpose amplifiers with 4 circuits in 14-SOIC packaging that provide equivalent functionality for applications not requiring J-FET input characteristics, with trade-offs in input bias current and supply voltage range.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA/nA)	Supply Span (V)	Output Current (mA)	Temp Range (°C)	Product Status
LF444CM	Texas Instruments	J-FET	1	1	10 pA	36	14	0 to 70	Obsolete
LF444CM/NOPB	Texas Instruments	J-FET	1	1	10 pA	36	14	0 to 70	Active
LF444CMX/NOPB	Texas Instruments	J-FET	1	1	10 pA	36	14	0 to 70	Active
LF247DT	STMicroelectronics	J-FET	16	4	20 pA	44	40	-40 to 105	Active
LF347D	STMicroelectronics	J-FET	16	3	20 pA	44	40	0 to 70	Active
LF347DT	STMicroelectronics	J-FET	16	4	20 pA	44	40	0 to 70	Active
LM224D	STMicroelectronics	General Purpose	0.4	1.2	20 nA	3 to 30	40	-40 to 105	Active
LM2902AQS14-13	Diodes Incorporated	General Purpose	0.3	0.7	20 nA	2 to 36	40	-40 to 125	Active
LM2902EDR2G	onsemi	General Purpose	—	—	90 nA	3 to 32	40	-40 to 105	Active
LM324DT	Rohm Semiconductor	General Purpose	0.3	1.3	20 nA	3 to 32	40	-40 to 85	Not For New Designs
MC3403DR2G	onsemi	General Purpose	0.6	1	200 nA	3 to 36	30	0 to 70	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LF444CM/NOPB and LF444CMX/NOPB are direct equivalents to the obsolete LF444CM. Both are manufactured by Texas Instruments with active product status. LF444CMX/NOPB is the manufacturer-recommended part for new designs, available in Cut Tape and Digi-Reel packaging with significantly higher inventory (30,100 units). Both parts maintain identical electrical specifications: 1 V/µs slew rate, 1 MHz gain bandwidth product, 10 pA input bias current, and 36V supply span. All three variants are ROHS3 compliant with MSL 1 rating.

For Enhanced Performance (J-FET Topology):

LF247DT and LF347DT from STMicroelectronics provide superior performance while maintaining J-FET input characteristics. These parts offer 16 V/µs slew rate (16× improvement), 4 MHz gain bandwidth product (4× improvement), 40 mA output current per channel (2.9× improvement), and 44V supply span. LF247DT supports extended operating temperature (-40°C to 105°C) compared to the LF444CM (0°C to 70°C). LF347DT maintains the 0°C to 70°C range. Both are active products with substantial inventory and ROHS3 compliance.

For Cost-Optimized Alternatives (General Purpose Amplifiers):

LM2902AQS14-13 (Diodes Incorporated) and LM224D (STMicroelectronics) are general purpose 4-circuit amplifiers in 14-SOIC packaging. These parts sacrifice J-FET input characteristics for lower cost and extended temperature ranges. LM2902AQS14-13 operates from -40°C to 125°C with AEC-Q100 automotive qualification. LM224D operates from -40°C to 105°C. Both maintain 40 mA output current per channel and are ROHS3 compliant. Input bias current increases to 20 nA (2000× higher than LF444CM), making these unsuitable for applications requiring ultra-low input bias current.

Not Recommended for New Designs:

LM324DT (Rohm Semiconductor) carries "Not For New Designs" status and should be avoided for new applications despite active inventory.

Frequently Asked Questions (FAQ)

Q: Can LF444CM/NOPB directly replace the obsolete LF444CM?

A: Yes. LF444CM/NOPB is electrically and mechanically identical to LF444CM, with identical specifications across all parameters: 1 V/µs slew rate, 1 MHz gain bandwidth product, 10 pA input bias current, 3 mV input offset voltage, 36V supply span, and 14-SOIC packaging. The primary difference is product status (Active vs. Obsolete) and packaging format (Tube vs. unspecified). Both are ROHS3 compliant.

Q: What is the difference between LF444CM/NOPB and LF444CMX/NOPB?

A: Both parts are electrically identical with identical specifications. The primary difference is packaging format: LF444CM/NOPB is supplied in Tube packaging, while LF444CMX/NOPB is supplied in Cut Tape and Digi-Reel format. LF444CMX/NOPB is the manufacturer-recommended part for new designs and has significantly higher inventory availability (30,100 units vs. 1,313 units).

Q: When should I use LF247DT or LF347DT instead of LF444CM?

A: Use LF247DT or LF347DT when your application requires enhanced performance specifications: 16× faster slew rate (16 V/µs vs. 1 V/µs), 4× higher gain bandwidth product (4 MHz vs. 1 MHz), or 2.9× higher output current (40 mA vs. 14 mA per channel). LF247DT additionally supports extended operating temperature (-40°C to 105°C). Both maintain J-FET input topology with low input bias current (20 pA). These parts are pin-compatible in 14-SOIC packaging.

Q: Are general purpose amplifiers like LM2902AQS14-13 suitable replacements?

A: General purpose amplifiers are functional alternatives only for applications that do not require J-FET input characteristics. Input bias current increases from 10 pA to 20 nA (2000× higher), making these unsuitable for high-impedance signal sources or precision instrumentation. Supply voltage range changes from 36V to 2-36V. Use general purpose amplifiers only when input bias current specifications are not critical and cost optimization is prioritized.

Q: What is the significance of the 14-SOIC package specification?

A: The 14-SOIC (Small Outline Integrated Circuit) package with 0.154" width and 3.90mm width is a surface mount standard. All substitute parts listed maintain this identical package specification, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes. No board redesign is required when substituting between parts with identical 14-SOIC packaging.

Q: Why does LF444CM have a 36V supply span while some substitutes have 44V?

A: Supply span represents the maximum voltage differential between positive and negative supply rails. LF444CM supports ±18V maximum (36V total span). LF247DT and LF347DT support ±22V maximum (44V total span). This difference reflects design improvements in the STMicroelectronics parts. For applications operating within ±18V, both specifications are equivalent. For applications requiring higher supply voltages, the enhanced parts provide additional headroom.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All parts listed in this reference maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity level rating. All parts are also REACH unaffected and classified as EAR99 for export control purposes.

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